My only experience is with my G100.
It's taken me a while and I'm sure if I attended an Open Garage of some type I would have the long extenstion cord wrapped around my neck by Mike himself.....
But, I've conquered most of my inabilities with exception to patience. The G100 although the least strongest machine among them, it's a great learners tool and stronger than the 6" oribital found at most retail stores that have no correction power at all.
My G100 spins 6" pads great, it spins the Soft Buff 2.0 7" pads with the W68DA backing plate. I had problems with the pad using the W67DA backing plate and use that one with my older pads. I plan on using the W67DA with some 5.5" pads when I get them someday.....
The G100 is kinda noisy but not irratating, I have 4 girls and a boy in the middle so, a little machine noise is nothing.....
My G100 is a re-labeled PC 7335 which is in the same family as the 7336/7424.
It works great with some patience and learning of product use and on a prepped surface.
Polishing paint is a combination of several factors, paint condition, correct product use, patience, machine and pad selection and did I mention patience? Kind of like a computer, you don't have a fast computer simply by having the fastest processor, the video card, FSB, Memory and fast/large hard disk drive is what makes it fast (or not).
I like the PC brand but the Griots looks good too! I'm not sure I'm ready for the Flex or need a flex for my own hobby and a car here and there for cash.....
Some good choice here and really can't go wrong with them.
Keep reading reviews of people and Mike's write ups using the products and get your pocket book out!
Have fun!
Aaron